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62- Limon-Gaynor silty clay loams, 2 to 12 percent slopes. The map unit is on foot <br /> slopes. The native vegetation is mainly grasses and shrubs. Elevation is 5,100 to 5,500 <br /> feet. The average annual precipitation is 11 to 13 inches, the average annual air <br /> temperature is 51 to 53-degree F, and the average frost-free period is 150 to 170 days. <br /> This unit is about 55 percent Limon soil and about 35 percent Gaynor soil. The Limon <br /> soil is on foot slopes and drainageways, and the Gaynor soil on side slopes and foot <br /> slopes. Included in this unit is about 10 percent shallow Midway clay loam un upper <br /> side slopes. Also included are 1 to 5 percent gullies, ranging generally 8 to 15 feet in <br /> depth. The Limon soil is deep and well drained. If formed in alluvium derived <br /> dominantly from shale. Typically, the surface layer is brown silty clay loam about 3 <br /> inches thick. The substratum is silty clay about 43 inches thick over shale at a depth of <br /> 46 inches. The soil is moderately alkaline. Permeability of the Limon soil is slow. <br /> Available water capacity is moderate. Effective rooting depth is 40 inches or more. <br /> Runoff is rapid to very rapid, and the hazard of water erosion is high to very high. The <br /> Gaynor soil is moderately deep and well drained. It formed in alluvium and residuum <br /> derived from shale. Typically, the surface layer is grayish brown silty clay loam about 4 <br /> inches thick. The substratum is silty clay about 26 inches thick over soft, weathered <br /> shale. The soil is moderately alkaline. Permeability of the Gaynor soil is slow. Available <br /> water capacity is low. Effective rooting depth is 20 to 40 inches. Runoff is rapid to very <br /> rapid, and hazard of water erosion is high to very high. When these solid dry, cracks <br /> form that are % to 12-inch-wide and 4 to 12 inches deep. This unit is used for <br /> rangeland. The potential plant community on the Limon soil is mainly alkali sacaton, <br /> blue grama, western wheatgrass, and fourwing saltbush. The average annual <br /> production of air-dry vegetation is about 800 pounds per acre. If the condition of the <br /> range deteriorates, fourwing saltbush, black greasewood, and blue grama increase. The <br /> potential plant community on the Gaynor soil is mainly alkali sacaton, blue grama, and <br /> western wheatgrass. The average annual. Production of air-dry vegetation is about 800 <br /> pounds per acre. If the condition of the range deteriorates, western wheatgrass, <br /> fourwing saltbush, shadscale, and frank bush increase. Livestock grazing should be <br /> managed to protect the unit from excessive erosion. If the plant cover is reduced, <br /> protection is needed to control gullying, streambank cutting, and sheet erosion. Loss of <br /> the surface layer results in a severe decrease in productivity and in the potential of the <br /> unit to produce plants suitable for grazing. The main limitations for seeding are poor <br /> tilth of the natural topsoil and the shallow wetting of the soils by natural precipitation. <br /> If this unit is used for homesite development, the main limitations are slow permeability <br /> and high shrink-swell capacity of the soils. Depth to shale is also a significant limitation <br /> of use of the soils as septic tank absorption fields where depth is less than about 40 <br /> inches. The effects of shrinking and swelling can be reduced by maintaining a constant <br /> moisture content around the foundation. Foundations and bearings walls should be <br /> designed to offset the effects of shrinking and swelling. Backfilling the excavation with <br /> material that has low shrink-swell potential can also reduce the effects of shrinking and <br />